Hee, Olman <br/><br/>
A statistical analysis of United States demand for phosphate rock, potash and nitrogen / 
by Olman Hee 
 - Washington, D. C. :  United States Government Printing Office,  1969 
 - 55 p. ;  28 cm. 
 - Information circular bureau of mines ;  8418 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rocks--Classification--Statistics<br/>Petrology--Statistics<br/>Rocks, Igneous--Statistics
<br/><br/><label>Dewey Class. No.: </label>552.1021